Reproducer for phonographs



J. A. BROWN.

REPRODUCER FOR PHONOGRAPHS.

APPLICATION FILED DEC. 8.1920.

Patented Feb. 14, 1922.-

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JULIUS A. BROWN, OF lEE'KSKILL, NEW YORK.

REPRODUCER FOR PHONOGRAPHS.

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Specification of Letters Patent.

Patented Feb. 14, 1922.

Application filed December 8, 1920. Serial No. 429,048.

To aZZ whom it may cancer/t:

Be it known that I, JU'LiUs ABROWN, a native of Austria, and who has applied for citizenship of the United States of America, and a resident of Peekskill, in the county of Westchester and State of New York, have in vented certain new and'useful Improvements in Reproducers for Phonographs, of which the following is a specification.

This invention has for its object to provide an improved form of phonograph reproducer in which the sound is caused to be received by a reduced passageway beyond the usual vibrating disk, in connection with other disks and also tongues, whereby the tone is very much improved and the scratching sounds and discords are removed, and a clear musical tone is produced.

A further object is to produce in connection with the said arrangement, a closed annular chamber that will assist in producing the desired effects.

In the accompanying drawing showing embodiments of my invention, Figure 1 is a front elevation.

Fig. 2 is a vertical section through the same.

Fig. 3 shows the circular plate.

Fig. 4; shows the disk carried by the circular plate.

Fig. 5 is a section through the latter.

Fig. 6 shows the several parts in a separated position.

Fig. 7 is a modification of the disk shown in Fig. l.

As shown in the drawing the device comprises essentially a frame, a rear supporting plate, a vibrating disk held by the frame and plate and provided with a stylus arm or bar, a sound tube on the rear member and an additional vibrating member.

As shown, I provide a frame in the form of a ring 2 having a flange 3 at the front against which is held the vibrating disk 4 connected with the stylus arm 5. The latter is shown as hinged at the bottom to a needle holder 6, which may be mounted in any suitable manner.

At the rear is a conical plate carrying a tube 8 at its center portion. This plate is secured to the frame 2 by screws 9 at the margin.

Between these members is secured a circular plate 10 that is held between the frame and the rear late by the screws 9. This circular plate as a conical inner portion 12 extending rearward with a central opening, and engaging the inner end of the sound tube 8, a washer 13 of rubber being interposed. By this means an annular closed chamber 14. is provided between the two conical walls 12 and '7 and the tube 8, as shown in Fig. 2 which serves to take up the vibrations and greatly improve the results.

At the center of the circular plate 10 is located a disk 15 that fits into a shoulder or ledge in the plate 10 and is secured therein by screws 16. This disk has a central opening at which is arranged a tongue 17 extending rearward being connected with the disk on its end portions, preferably integral therewith and formed by casting. One or more cars 18 extend from this tongue to the disk to support the tongue.

It will be seen that the disk 10 is supported at its margins only and is hence free to vibrate, and that the tongue and ears carried thereby project freely into the tube 8 from the opening in the disk. The tongue and ears are preferably cut away at the inner portion adjacent the opening as indicated at 19 to provide a better distribution of the sound.

In Fig. 5 it will be seen that the. tongue has its forward end extending across the opening in the disk 15, and is not cut away as shown in the other views. The tongue preferably extends back through the rear tube 8 for most of its length; and may be given a slight bend or curve downwardly or in Ciahe direction of the stylus bar at its free on The circular plate 10 has its middle portion 12 arranged conical and projecting rearward opposite the flat wall of the disk 15, thereby forming between these walls an annular chamber that is open at the middle portion to the aperture in the disk and to the central opening in the conical wall 12. It will be further seen that the rear wall 7 is also conical, and extends rearward offset a considerable distance from the conical wall 12, and forms by these two walls and the tube 8 a closed annular chamber, whose wall portion 12 is exposed to the vibrations in the said inner annular chamber between the walls 15 and 12. The vibration is primarily caused by the diaphragm 4, and from it communicated to the disk 15 and the tongue 17 and the vibrations thereby transmitted to the small annular chamber described and increasing thereby, which vibrations are thereby transmitted to the closed annular chamber and further increased. The vibrations are further transmitted by the tongue 17 that extends back into the tube 8, and

thence the sound is carried to the tone-arm central opening and projecting rearwardly of the frame, said tongue having a transverse wing at its base connecting it with the said disk. 7

3. In a phonograph reproducer, the combination With a frame member, of a rear plate, and a disk secured to the said plate, said disk having a central opening, and a tongue extending from the disk at the central opening and projecting rearwardly of the frame, said tongue having a transverse Wing at its base connecting 'it'with the said disk, said tongue and Wing having their base portions removed adjacent the central opening of the disk.

Signed at N. Y. city, N, Y., on November JULIUS A. BROWN. 

